On the V1 it's up to 400 and 800 and 3200. It's 1600 that is not selectable on either one.

I mostly shoot in auto 800 mode

This is the most frustrating aspect of the V1 for me, everything else I've gotten used to. For my use ISO 800 isn't high enough so I've been keeping it at ISO 3200 lately. Sometimes it's a bit too high, but not often and I get a decent number of shots in the ISO 1000-2500 range that clean up well enough in Lightroom.